{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-74351", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74351", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-08-15T05:58:37.967Z", "updatedAt": "2026-08-17T05:17:44.780Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ocfs2: rebase copied fsdlm LVB pointers in locking_state", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: rebase copied fsdlm LVB pointers in locking_state\n\nThe locking_state debugfs iterator snapshots struct ocfs2_lock_res by\nvalue under ocfs2_dlm_tracking_lock and later formats that copy in\nocfs2_dlm_seq_show(). That is fine for the inline fields, but the\nuserspace fsdlm stack stores the LVB through lksb_fsdlm.sb_lvbptr. Once\nthe iterator drops the tracking lock, a copied non-NULL sb_lvbptr still\npoints into the original lockres owner, so teardown can free that\ncontainer before the debugfs dump walks the raw LVB bytes.\n\nRebase the copied sb_lvbptr to the copied l_lksb before dumping the raw\nLVB. The seq snapshot already carries the inline LVB storage reserved in\nstruct ocfs2_dlm_lksb, so the debugfs reader can dump the copied bytes\nwithout borrowing the original lockres lifetime.\n\nThe buggy scenario involves two paths, with each column showing the order\nwithin that path:\n\nlocking_state reader: lockres teardown:\n1. ocfs2_dlm_seq_start()/next() 1. file release or another owner\n copies struct ocfs2_lock_res teardown reaches\n2. ocfs2_dlm_seq_show() formats ocfs2_lock_res_free()\n the copied row 2. the lockres is removed from the\n3. ocfs2_dlm_lvb() follows the tracking list\n copied sb_lvbptr 3. the owner frees the original\n lockres container\n\nValidation reproduced this kernel report:\nKASAN slab-use-after-free in ocfs2_dlm_seq_show+0x1bd/0x430\nRIP: 0033:0x7f8ec4b1e29d\nThe buggy address belongs to the object at ffff88810a1e0800 which belongs\nto the cache kmalloc-1k of size 1024\nThe buggy address is located 368 bytes inside of freed 1024-byte region\n[ffff88810a1e0800, ffff88810a1e0c00)\nRead of size 1\nCall trace:\n dump_stack_lvl+0x66/0xa0\n print_report+0xce/0x630\n ocfs2_dlm_seq_show+0x1bd/0x430 (fs/ocfs2/dlmglue.c:3137)\n srso_alias_return_thunk+0x5/0xfbef5\n __virt_addr_valid+0x19f/0x330\n kasan_report+0xe0/0x110\n seq_read_iter+0x29d/0x790\n seq_read+0x20a/0x280\n find_held_lock+0x2b/0x80\n rcu_read_unlock+0x18/0x70\n full_proxy_read+0x9e/0xd0\n vfs_read+0x12c/0x590\n ksys_read+0xd2/0x170\n do_user_addr_fault+0x65a/0x890\n do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nAllocated by task stack:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0xaa/0xb0\n ocfs2_file_open+0x13e/0x300\n do_dentry_open+0x233/0x7f0\n vfs_open+0x5a/0x1b0\n path_openat+0x66d/0x1540\n do_file_open+0x186/0x2b0\n do_sys_openat2+0xce/0x150\n __x64_sys_openat+0xd0/0x140\n do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nFreed by task stack:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x5f/0x80\n kfree+0x313/0x590\n ocfs2_file_release+0x138/0x260\n __fput+0x1df/0x4b0\n fput_close_sync+0xd2/0x170\n __x64_sys_close+0x55/0x90\n do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "cf4d8d75d8aba537a19b313a9364fd08ddbd5622", "status": "affected", "versionType": "git", "lessThan": "185427b5f7a209254c85c18aad5a4a8e009b2f30" }, { "version": "cf4d8d75d8aba537a19b313a9364fd08ddbd5622", "status": "affected", "versionType": "git", "lessThan": "07aa4a8ebacde3d0ba50f60d2964f274ee7629bc" }, { "version": "cf4d8d75d8aba537a19b313a9364fd08ddbd5622", "status": "affected", "versionType": "git", "lessThan": "e037c1250cc90e7aacb002357d1b0399fc65ecfc" }, { "version": "cf4d8d75d8aba537a19b313a9364fd08ddbd5622", "status": "affected", "versionType": "git", "lessThan": "6b38a5b8ee951e5b244e9a3c3d28d0f5e7c51411" }, { "version": "cf4d8d75d8aba537a19b313a9364fd08ddbd5622", "status": "affected", "versionType": "git", "lessThan": "8614a8f7e81edd34c9f67e454e7024fd12a2a341" }, { "version": "cf4d8d75d8aba537a19b313a9364fd08ddbd5622", "status": "affected", "versionType": "git", "lessThan": "bb44a7690a4d553da705919cf666a80f5ca9011c" }, { "version": "cf4d8d75d8aba537a19b313a9364fd08ddbd5622", "status": "affected", "versionType": "git", "lessThan": "610a0d2a35496738e1472fb0f318d5008a1c634f" }, { "version": "cf4d8d75d8aba537a19b313a9364fd08ddbd5622", "status": "affected", "versionType": "git", "lessThan": "93612d48fa42b3d1a637eb9279e15281c611c000" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.26", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.26" }, { "version": "5.10.261", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.212", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.178", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.145", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.97", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.40", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.5", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }